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<p>Polymer coatings with enhanced mechanical properties and deformation behavior, as well as energy dissipation capacity, have attracted increasing attention for broad functional applications. This work investigates the role of winding angles and diameter ratios on the tensile properties, damage behavior, and spatial Poisson’s ratio distribution of helical auxetic yarns (HAYs) and their polyurea-based composites. Optimal mechanical performance was observed for HAYs with a 5° winding angle and a 9:1 diameter ratio, resulting in a 1.6–2.4 fold increase in fracture energy and a maximum negative Poisson’s ratio of −11.18. When embedded in polyurea, HAYs increased the composite’s tensile strength by 1.50–2.46 times and energy dissipation by 2.65 times compared to pure polyurea. The composites also exhibited a significant negative Poisson’s ratio of −7.75. The deformation behavior was characterized by using digital speckle correlation method (DSCM) to determine strain and displacement fields in the elastic and plastic regimes. These findings establish a quantitative relationship between HAYs structural parameters and the mechanical response of such composite coatings.</p>

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Tensile properties, time-dependent deformation and damage mechanisms of polyester-carbon fiber helical auxetic yarn/polyurea composite coatings

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Xia Yu,
  • Yanxuan Ma,
  • Yun Zhang,
  • Peng Wang,
  • Jin Liu,
  • Zhipeng Zhang,
  • Shuaifei Wang,
  • Yuhua Gao

摘要

Polymer coatings with enhanced mechanical properties and deformation behavior, as well as energy dissipation capacity, have attracted increasing attention for broad functional applications. This work investigates the role of winding angles and diameter ratios on the tensile properties, damage behavior, and spatial Poisson’s ratio distribution of helical auxetic yarns (HAYs) and their polyurea-based composites. Optimal mechanical performance was observed for HAYs with a 5° winding angle and a 9:1 diameter ratio, resulting in a 1.6–2.4 fold increase in fracture energy and a maximum negative Poisson’s ratio of −11.18. When embedded in polyurea, HAYs increased the composite’s tensile strength by 1.50–2.46 times and energy dissipation by 2.65 times compared to pure polyurea. The composites also exhibited a significant negative Poisson’s ratio of −7.75. The deformation behavior was characterized by using digital speckle correlation method (DSCM) to determine strain and displacement fields in the elastic and plastic regimes. These findings establish a quantitative relationship between HAYs structural parameters and the mechanical response of such composite coatings.